Towards Homoleptic Naphthalenemetalates of the Later Transition Metals: Isolation and Characterization of Naphthalenecobaltates(1−)

Abstract

Storable sources of transition-metal atoms, or "naked-metalatom" reagents, were first discovered in the pioneering research of Wilke and co-workers, which involved spectacular homoleptic alkene nickel (0)

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“…29 Anion 5 has a distorted tetrahedral coordination environment about the iron center, with a twist angle of 83°, which is close to that of anion 1 (85°) 15. Overall, the structure of 5 shows no unusual features and is quite similar to that of the previously reported 18‐electron naphthalene cobaltate, [Co(η 4 ‐C 10 H 8 )(η 4 ‐cod)] − 5b. 30…”

“…33 We believe the production of an Fe 0 complex in this and related reactions34 involves initial formation of a mixed‐ligand Fe −I intermediate, which is a sufficiently strong reducing agent to convert coordinated or free anthracene to the observed anthracene anion. Because naphthalene is more difficult to reduce than anthracene,35 and because η 4 ‐naphthalene complexes appear to be generally more labile than analogous anthracene compounds,36, 37 the unknown naphthalene analog of 1 , or perhaps an iron version of the recently reported cobaltate [Co(η 4 ‐C 10 H 8 )(η 4 ‐cod)] − 5b could prove to be more effective precursors than 1 to new Fe −I complexes.…”